Combining tube for ejectors



Jul 1 1924.

H. F. SCHMIDT COMBINING TUBE FOR EJECTORS' Filed April 21, 1920 INVFNTOR. Henry F. Schmndf BY ATTORNEY Patented July 1, 1924.

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Parent HENRY F. SCHMIDT, 0F SWARTHMORE, PENNSYLVANIA, ASSIGNOR T0 WESTING- HOUSE ELECTRIC AND MANUFACTURING- COMPANY, A CORPORATION OF PENNSYL- VANIA.

COMBINING TUBE FO'R EJECTORS.

Application filed April 21, 1920. Serial No. 375,550.

To all whom it may concern:

Be it known that I, HENRY F. SCHMIDT, a citizen of the United States, and a resident of Swarthmore, in the county of Delaware and State of Pennsylvania, have invented a new and useful Improvement in Combining Tubes for Ejectors, of which the following is a specification.

This invention relates to fluid translating devices and particularly to combining tubes for ejectors and the like.

Ejectors are ordinarily provided with a combining tube in which the fluid to be translated is entrained and accelerated. In

" order to initially establish normal operation it is usually necessary to provide an overflow of some kind for the ejector; so that the discharge pressure is relatively low and so that the fluids initially entrained may be accelerated to a velocity sufficient to give them the necessary momentum to establish normal operation of the ejector.

A well known method of providing an overflow is to hinge a movable portion of the combining tube wall so that it is free to swing outward at one end and to thereby allow the fluids to escape. The usual practice has been to'hinge the loose portion of the wall at the large end of the combining tube consequently the greatest overflow opening must occur near the small or discharge end of the combining tube. I have found that the greatest tendency to overflow may occur at various points along the length of the combining tube and that it is desirable to provide an arrangement where by the maximum overflow opening may occur wherever the greatest tendency of the fluids to overflow occurs.

An object of my invention is to provide a new and improved ejector in which the overflow arrangement is such that the maximum overflow opening is variable in position.

A. further object is to produce a new and improved overflow arrangement for ejectors which is self-adjusting and permits the maximum overflow to occur at the point where the tendency to overflow is greatest.

These and other objects which will be made apparent throughout the further description of my invention are accomplished by means of apparatus embodying the features of my invention herein described and illustrated in the drawing accompanying and forming a part hereofr The drawing is a diagrammatic view of a combining tube of an ejector constructed in accordance with my invention.

In the drawing, I have illustrated a converging combining tube 5 having a movable wall 6 for allowing'fluids to overflow from the combining tube. As shown, the combining tube 5 is integrally formed with a divergent diffuser 7. The movable wall 6 is illustrated as provided with two pins 8 and 9, one near each end of the movable wall, which operate in guides 10 and 11 secured to the combining tube 5 and limitingthe movement of the wall 6, the pin 8 being mounted 011 a lug or ear 6. As shown, the guide 10 is provided with a straight slot 12, only slightly wider than the pin 8, while the gulde 11 is provided with a relatively wide slot 13. This arrangement allows the pin 9 tomove longitudinally of the combine ing tube in case only one end of the wall 6 springs outward. That is, the slot 12 in the guide 10 maintains the wall 6 in its proper longitudinal position, while either or both guides 10 and 11 limit its movement away from the combining tube 5. As illustrated, one end of the movable wall 6 is are shaped, the arc being described from pin 8 as a center, so as to allow the small end of the wall to swing out, and at the small end I have shown a gap 14, which not only provides clearances so: that the large end of the movable wall may moveout, but also acts as an overflow port when the amount of fluid to be discharged through the overflow is small.

On starting the ejector, the movable wall maximum tendency to overflow occur at a point corresponding to the center of gravity of the movable wall 6, the yielding motion will be rectilinear; in all other cases the motion will have a tilting component. Normally at starting the maximum tendency to overflow occurs near the large end of the movable wall 6 and the end swings out'so as to form the maximum overflow opening at that end, thereby avoiding deflection of the jet at the discharge end away from the diffuser. Of course, when the large end of around the circumference thereof.

I have found that an arrangement such as that illustrated is especially advantageous in condensate ejectors, but, it will be understood that it may equally well be employed in any other type of ejector-s.

While I have shown my invention in but one form, it will be obvious to those skilled in the art that it is not so limited, but is susceptible of various other changes and modifications, without departing from the spirit thereof, and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art or as are specifically set forth in the appended claims.

hat I claim is 1. An ejector combining tube including a movable wall member, said member being so designed and secured to the combining tube that one end thereof may move outwardly only in a path substantially normal to the axis of the tube and that the other end thereof may freely swing outwardly.

2. An ejector combining tube including a movable wall member, said member having an arcuate end portion adapted to engage a cooperating arcuate surface upon the combining tube, and means permitting oscillatory movements of the wall member about an axis coincident with the axis of the arcuate end portion.

8. An ejector combining tube including a movable wall member, said member having an arcuate end portion adapted to engage a cooperating arcuate surface upon the combining tube, means permitting oscillatory movements of the wall member about an axis coincident with the axis of the arcuate end portion, and means for permitting the movement of the axis of oscillation limited to a plane normal to the axis of the combining tube.

4-. An ejector combining tube including a movable wall member, the surface of jointure between one end of the said member and the said tube defining an arcuate surface,- and means for permitting oscillatory movements of the wall member about an axis coincident with the axis of the said arcuate surface.

5. An ejector combining tube including a movable wall member, the surface of jointure between one end of the said member and the said tube defining an arcuate surface, means for permitting oscillatory move ments of the wall member about an axis coincident with the axis of the said arcuate surface, and means for permitting the move ment of the axis of oscillation limited to a plane normal to the axis of the combining tube.

6. An ejector combining tube including a movable wall member, the surface of join ture between one end of the said member and the said tube defining an arcuate surface, a pin secured to said member and lying in the axis of the arcuate surface and guiding means for said pin.

7. An ejector combining tube including a movable wall member, the surface of jointure between one end of the said member and the said tube defining an arcuate surface, a pin secured to said member and lying in the axis of the arcuate surface and guide means for said pin limiting its movement to a path normal to the axis of the tube.

8. An ejector combining tube including movable wall member, the surface of jointure between one end of the said member and the said tube defining arcuate surface, a pin secured to said member and lying in the axis of the arcuate surface, guide means for said pin limiting its movement to a path normal to the axis of the tube, and means permitting oscillatory and radial movements of the other end of said member.

9. An ejector combining tube including a movable wall member, a pin secured to said member adjacent one end thereof, guide means for said pin limiting its movement to path normal to the axis of said tube, a second pin secured to said member adjacent the other end thereof, and guide means for said second pin permitting oscillatory and radial movements thereof.

10. An ejector combining tube including a movable wall member, a pin secured to said member adjacent one end thereof, guide means for said pin limiting its movement to paths normal to the axis of said tube, and means permitting oscillatory and radial movements of the other end of said member.

In testimony whereof, I have hereunto subscribed my name this April 16, 1920.

HENRY F. SCHMIDT. 

